\begin{tabular}{@{}c@{}}
\begin{tabular}{l*{15}{c}}
\toprule
& \multicolumn{5}{c}{\textbf{Night Sleep Duration in Hours}} & \multicolumn{5}{c}{\textbf{Night Sleep Efficiency in \% }} &    \multicolumn{5}{c}{\textbf{Nap Sleep Duration in Minutes}}\\
\cmidrule(lr){2-6}\cmidrule(lr){7-11}\cmidrule(lr){12-16} & & \makecell{X=Sleep \\ Duration} & \makecell{X=Sleep \\ Efficiency} & \makecell{X=Baseline \\ Naps} & \makecell{X=Female} & & \makecell{X=Sleep \\ Duration} & \makecell{X=Sleep \\ Efficiency} & \makecell{X=Baseline \\ Naps} & \makecell{X=Female} & & \makecell{X=Sleep \\ Duration} & \makecell{X=Sleep \\ Efficiency} & \makecell{X=Baseline \\ Naps} & \makecell{X=Female} \\
& (1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9) & (10) & (11) & (12) & (13) & (14) & (15) \\
\midrule
Night-Sleep Treatments & 0.48*** & 0.46*** & 0.46*** & 0.38*** & 0.37*** & -0.14 & -0.18 & -0.17 & -1.29 & -0.59 & & & & \\
& (0.05) & (0.08) & (0.08) & (0.12) & (0.11) & (0.42) & (0.65) & (0.65) & (0.80) & (0.79) & & & & \\
\addlinespace
X & & -0.04 & 0.15* & -0.11 & -0.11 & & 0.15 & 0.13 & -0.62 & 0.71 & & 0.21 & -0.14 & -0.05 & -0.34 \\
& & (0.11) & (0.09) & (0.11) & (0.10) & & (0.73) & (0.81) & (0.78) & (0.82) & & (0.15) & (0.14) & (0.17) & (0.20) \\
\addlinespace
Night-Sleep Treatments*X & & 0.03 & 0.04 & 0.12 & 0.17 & & 0.09 & 0.06 & 1.56 & 0.68 & & & & \\
& & (0.10) & (0.10) & (0.14) & (0.12) & & (0.82) & (0.86) & (0.97) & (0.95) & & & & \\
\addlinespace
Nap Treatment & & & & & & & & & & & 13.84*** & 13.62*** & 13.34*** & 13.24*** & 13.30***\\
& & & & & & & & & & & (0.30) & (0.42) & (0.42) & (0.63) & (0.55)\\
\addlinespace
Nap Treatment*X & & & & & & & & & & & & 0.46 & 0.98* & 0.81 & 0.81 \\
& & & & & & & & & & & & (0.58) & (0.58) & (0.71) & (0.64)\\
\addlinespace
\midrule
 DV Control Group Mean & 5.60 & 5.60 & 5.60 & 5.60 & 5.60 & 69.83 & 69.83 & 69.83 & 69.83 & 69.83 &&&& \\
 Participants & 451& 451 & 451 & 451 & 451 & 451 & 451 & 451 & 451 & 451 & 452 & 452 & 452 & 452 & 452 \\
\bottomrule
\end{tabular}
\end{tabular}
